This article believes that there is a general theory of psychology in various schools of psychology. The establishment of this general psychological theory can be extended from cognitive psychology and cognitive behavioral therapy, and the study of cognitive processes can be extended to all psychological processes. Cognitive behavioral therapy has a "three-step approach", namely: finding the psychological process + describing the psychological process + modifying the psychological process. The article extends this practice to all fields of psychology, so as to establish a general theory of psychology. The article uses a different method from "cognitive psychology analogy to computer structure", compares "psychological process" with computer program, and regards psychological activity as a program. The paper also proposes completely different research methods from the current mainstream psychology, and completely different research methods in physics, namely "introspection" and "physiological observation", but this "introspection" is different from the "introspection" of Wundt. The article believes that the term "psychological process" is not accurate, so it was changed to "psychological program", the real name of the theory is called "psychological program". This paper attempts to reveal through case analysis that psychological activities are a set of programs and that the cause of mental illness is error in operation of the programs or the establishment of erroneous programs. By modifying or learning to use these psychological programs correctly, mental illness can be treated precisely and thoroughly. The complete psychotherapy process is represented by the following: analysis + modification of psychological programs.In order to perform certain tasks, life bodies need to initiate a series of psychological or physiological activities, which is the process of psychological or physiological activities called "psychological program". Psychological program is an abstract concept, and it is not a material entity. The search for psychological activity programs mainly depends on psychological analysis and scientific hypnosis.